/Engine/Source/Runtime/Core/Public/Hash/xxhash.h
Use a ChunkSize large enough to cover task overhead, e.g., 256+ KiB. Hashing the same buffer with different chunk sizes produces a different output hash.
static [FXxHash64](API\Runtime\Core\Hash\FXxHash64) HashBufferChunked ( const void * Data, uint64 Size, uint64 ChunkSize )